Thermal Behavior of Quasi-isotropic Strand and Stacked-Tape Conductor
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ORIGINAL PAPER
Thermal Behavior of Quasi-isotropic Strand and Stacked-Tape Conductor Yueyin Wang1
· Yinshun Wang2 · Yang Nie1 · Yiran Meng1 · Wei Pi2
Received: 7 May 2020 / Accepted: 19 June 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this study, the thermal processes of a quasi-isotropic conductor in response to a heat disturbance are studied in detail, by combining simulations and experiments. A simulation model considering the anisotropy in the heat transfer coefficient of high-temperature superconducting (HTS) materials was established. The quasi-isotropic superconductor (QIS) was tested from 20 to 77 K, and the stacked tapes conductor (STC) was tested synchronously for the convenience of comparison. Compared with STC, the internal temperature distribution of QIS exhibits high isotropy and lower temperature rise. The thermal process following local tapes quenching is analyzed through simulation. The results show that the temperature rise of QIS is more uniform and lower than that of STC, which brings better thermal stability response to a heat disturbance. Keywords QIS · Quench · STC · Thermal behavior · Thermal quasi-isotropic
1 Introduction Second-generation (2G) high-temperature superconductor (HTS), or (Re)Ba2Cu3Ox (ReBCO), has obvious advantages in fields, such as power transmission and thermonuclear fusion [1–4], due to characteristics such as a high critical current and a high field capabilities [5, 6].
Yueyin Wang
[email protected] Yinshun Wang [email protected] Yang Nie [email protected] Yiran Meng [email protected] Wei Pi [email protected] 1
The Key Lab of HV and EMC Beijing Electrical, Electronic Engineering School, North China Electric Power University, Beijing 102206, China
2
The State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources and the Key Lab. of HV and EMC Beijing, North China Electric Power University, Beijing 102206, China
Thermal stability of a conductor made of superconducting materials, usually affected by heat transfer performance, is the ability to recover from a thermal disturbance. If the heat transfer is not good, conductor will quench and go through a positive feedback progress with both temperature and voltage increasing (thermal runaway). The conductor might be damaged if the hot spot temperature exceeds a certain value [7–10]. However, due to the limitation of refrigeration conditions, its heat transfer efficiency depends largely on the conductor structure. Therefore, optimizing the structure of the superconducting conductor is the key to their stable operation. 2G superconducting materials are anisotropic in their magnetic fields and heat transfer properties, while QIS not only exhibit quasi-isotropic in their external magnetic field environment but should also perform well in terms of heat transfer. The critical currents and bending quasi-isotropy of QIS have been studied [11–14], while temperature quasi-isotropy has not been studied. This article will examine the heat transfer beha
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